VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 → FuelTech FT450 (auto)
VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 — FuelTech — FT450
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-12
Before you start
Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 4: read the Findings page before cutting any wire |
| Size of the job | 36 wires · 5 connectors · 0 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Order of work | 1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up. |
Build checklist
Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.
| Wire | From | To | Gauge | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-A-23 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | FT450-A-A13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-A-1 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-10 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-55 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-56 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-7 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | FT450-A-A7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-A-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-33 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-67 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | FT450-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-A-41 | FT450-A-A14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-A-68 | FT450-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | FT450-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-A-44 | FT450-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-A-8 | FT450-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-A-60 | FT450-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-A-52 | FT450-A-A10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-A-24 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-A-3 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-26 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-4 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-25 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-2 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-A-17 | FT450-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-40 | FT450-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-14 | FT450-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-49 | FT450-A-A6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-6 | FT450-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-9 | FT450-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-27 | FT450-A-A5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-20 | FT450-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-15 | FT450-A-A26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-36 | FT450-A-A23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-A-37 | FT450-A-A25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ |
Bench test (before first power-up)
Battery disconnected, ECU and every sensor unplugged. Meter on resistance. Each pair below must read open (OL): a reading means a pinched wire, a stray strand or a mis-pinned cavity. Then check continuity of every wire (last column of the build checklist).
| # | Probe A | Probe B | Expect | Why | Reading |
|---|---|---|---|---|---|
| 1 | FT450-A-A12 | FT450-A-A13 | open (OL) | sensor ground must not touch +12 V supply | |
| 2 | FT450-A-A12 | FT450-A-A14 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 3 | FT450-A-A13 | FT450-A-A14 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 4 | FT450-A-A7 | FT450-A-A13 | open (OL) | power ground must not touch +12 V supply | |
| 5 | FT450-A-A7 | FT450-A-A14 | open (OL) | power ground must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
FT450-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | Injector 1 (Bank A) | — | W20 | — | 0.5 | OEM-A-24 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W22 | — | 0.5 | OEM-A-26 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W24 | — | 0.5 | OEM-A-25 | — | — | — |
| A10 | Ignition 3 | — | W19 | — | 0.5 | OEM-A-52 | — | — | — |
| A11 | Ignition 4 | — | — | — | — | — | — | — | — |
| A12 | Signal ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| A13 | +12V switched | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| A14 | +5V sensor supply | — | W13 | — | 0.5 | OEM-A-41 | — | — | — |
| A15 | CAN A LOW | — | — | — | — | — | — | — | — |
| A16 | CAN A HIGH | — | — | — | — | — | — | — | — |
| A17 | Phase input (cam) | — | W16 | — | 0.5 | OEM-A-44 | — | — | — |
| A18 | RPM reference (crank -) | — | W14 | — | 0.5 | OEM-A-68 | — | — | — |
| A18 | RPM reference (crank -) | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| A19 | RPM signal (crank +) | — | — | — | — | — | — | — | — |
| A2 | Injector 2 (Bank A) | — | W21 | — | 0.5 | OEM-A-3 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W23 | — | 0.5 | OEM-A-4 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W25 | — | 0.5 | OEM-A-2 | — | — | — |
| A20 | White input 1 | — | W26 | — | 0.5 | OEM-A-17 | — | — | — |
| A21 | White input 2 | — | W27 | — | 0.5 | OEM-A-40 | — | — | — |
| A22 | White input 3 (TPS) | — | W33 | — | 0.5 | OEM-A-20 | — | — | — |
| A23 | White input 4 (oil pressure) | — | W35 | — | 0.5 | OEM-A-36 | — | — | — |
| A24 | White input 5 (water temp) | — | W28 | — | 0.5 | OEM-A-14 | — | — | — |
| A25 | White input 6 (fuel pressure) | — | W36 | — | 0.5 | OEM-A-37 | — | — | — |
| A26 | White input 7 (air temp) | — | W34 | — | 0.5 | OEM-A-15 | — | — | — |
| A3 | Aux 1 | — | W30 | — | 0.5 | OEM-A-6 | — | — | — |
| A4 | Aux 2 | — | W31 | — | 0.5 | OEM-A-9 | — | — | — |
| A5 | Aux 3 | — | W32 | — | 0.5 | OEM-A-27 | — | — | — |
| A6 | Aux 4 (fuel pump / relays) | — | W29 | — | 0.5 | OEM-A-49 | — | — | — |
| A7 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| A8 | Ignition 1 | — | W17 | — | 0.5 | OEM-A-8 | — | — | — |
| A9 | Ignition 2 | — | W18 | — | 0.5 | OEM-A-60 | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ground (E-1) | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| 10 | Ground (OBD1 EGR enable) | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | Coolant temperature (CLT) | — | W28 | — | 0.5 | FT450-A-A24 | — | — | — |
| 15 | EGR temperature sensor | — | W34 | — | 0.5 | FT450-A-A26 | — | — | — |
| 16 | MAF ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | MAF signal | — | W26 | — | 0.5 | FT450-A-A20 | — | — | — |
| 2 | Injector 6 (cyl 6) | — | W25 | — | 0.5 | FT450-A-A2 | — | — | — |
| 20 | O2 sensor 1 (primary) | — | W33 | — | 0.5 | FT450-A-A22 | — | — | — |
| 21 | Diagnostic L-line | — | — | — | — | — | — | — | — |
| 22 | Tachometer output | — | — | — | — | — | — | — | — |
| 23 | ECU main power (from engine-electronics relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 24 | Injector 1 (cyl 1) | — | W20 | — | 0.5 | FT450-A-A1 | — | — | — |
| 25 | Injector 5 (cyl 5) | — | W24 | — | 0.5 | FT450-A-A1 | — | — | — |
| 26 | Injector 3 (cyl 3) | — | W22 | — | 0.5 | FT450-A-A1 | — | — | — |
| 27 | Idle air control valve | — | W32 | — | 0.5 | FT450-A-A5 | — | — | — |
| 3 | Injector 2 (cyl 2) | — | W21 | — | 0.5 | FT450-A-A2 | — | — | — |
| 31 | EVAP canister purge valve | — | — | — | — | — | — | — | — |
| 33 | Sensor ground bus | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Knock sensor 1 | — | — | — | — | — | — | — | — |
| 36 | Intake air temperature (IAT) | — | W35 | — | 0.5 | FT450-A-A23 | — | — | — |
| 37 | A/C compressor switch | — | W36 | — | 0.5 | FT450-A-A25 | — | — | — |
| 38 | Ignition switch (run/start) | — | — | — | — | — | — | — | — |
| 39 | A/C switch (cabin) | — | — | — | — | — | — | — | — |
| 4 | Injector 4 (cyl 4) | — | W23 | — | 0.5 | FT450-A-A2 | — | — | — |
| 40 | Throttle position sensor 1 | — | W27 | — | 0.5 | FT450-A-A21 | — | — | — |
| 41 | TPS power (+5V) | — | W13 | — | 0.5 | FT450-A-A14 | — | — | — |
| 43 | Diagnostic K-line | — | — | — | — | — | — | — | — |
| 44 | Camshaft position sensor (G40) | — | W16 | — | 0.5 | FT450-A-A17 | — | — | — |
| 49 | Secondary air injection relay control | — | W29 | — | 0.5 | FT450-A-A6 | — | — | — |
| 5 | Check engine light (MIL) | — | — | — | — | — | — | — | — |
| 51 | MFA fuel-consumption signal | — | — | — | — | — | — | — | — |
| 52 | Ignition coil 4 (coil pack pin 4) | — | W19 | — | 0.5 | FT450-A-A10 | — | — | — |
| 53 | Idle air control valve (2nd) | — | — | — | — | — | — | — | — |
| 54 | Battery constant (+12V) | — | — | — | — | — | — | — | — |
| 55 | Ground (E-3) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 56 | Ground (E-4) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 59 | Mass airflow sensor (5th terminal) | — | — | — | — | — | — | — | — |
| 6 | Fuel pump relay control | — | W30 | — | 0.5 | FT450-A-A3 | — | — | — |
| 60 | Ignition coil 3 (coil pack pin 3) | — | W18 | — | 0.5 | FT450-A-A9 | — | — | — |
| 65 | Vehicle speed sensor (VSS) | — | — | — | — | — | — | — | — |
| 67 | Crank sensor return (VR-) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 68 | Crank position sensor (G28, VR+) | — | W14 | — | 0.5 | FT450-A-A18 | — | — | — |
| 7 | Ground (E-2) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 8 | Ignition coil 2 (coil pack pin 2) | — | W17 | — | 0.5 | FT450-A-A8 | — | — | — |
| 9 | Engine electronics relay control | — | W31 | — | 0.5 | FT450-A-A4 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-A-16 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-A-33 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-A-67 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | FT450-A-A12 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | FT450-A-A18 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-23 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | FT450-A-A13 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.85 | OEM-A-1 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-A-10 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-A-55 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-56 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-A-7 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | FT450-A-A7 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Ground (E-1) | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-A-10 | Ground (OBD1 EGR enable) | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-A-14 | Coolant temperature (CLT) | temp_in | FT450-A-A24 | White input 5 (water temp) | temp_in | single_source | |
| OEM-A-15 | EGR temperature sensor | temp_in | FT450-A-A26 | White input 7 (air temp) | temp_in | single_source | |
| OEM-A-16 | MAF ground | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-A-17 | MAF signal | analog_in | FT450-A-A20 | White input 1 | analog_in | single_source | |
| OEM-A-2 | Injector 6 (cyl 6) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | single_source | |
| OEM-A-20 | O2 sensor 1 (primary) | lambda_nb_in | FT450-A-A22 | White input 3 (TPS) | analog_in | single_source | |
| OEM-A-21 | Diagnostic L-line | serial | — | — | — | single_source | |
| OEM-A-22 | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-A-23 | ECU main power (from engine-electronics relay) | power_in | FT450-A-A13 | +12V switched | power_in | single_source | |
| OEM-A-24 | Injector 1 (cyl 1) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | single_source | |
| OEM-A-25 | Injector 5 (cyl 5) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | single_source | |
| OEM-A-26 | Injector 3 (cyl 3) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | single_source | |
| OEM-A-27 | Idle air control valve | low_side_out | FT450-A-A5 | Aux 3 | low_side_out | single_source | |
| OEM-A-3 | Injector 2 (cyl 2) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | single_source | |
| OEM-A-31 | EVAP canister purge valve | low_side_out | — | — | — | single_source | |
| OEM-A-33 | Sensor ground bus | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-A-34 | Knock sensor 1 | knock_in | — | — | — | single_source | |
| OEM-A-36 | Intake air temperature (IAT) | temp_in | FT450-A-A23 | White input 4 (oil pressure) | analog_in | single_source | |
| OEM-A-37 | A/C compressor switch | digital_in | FT450-A-A25 | White input 6 (fuel pressure) | analog_in | single_source | |
| OEM-A-38 | Ignition switch (run/start) | digital_in | — | — | — | single_source | |
| OEM-A-39 | A/C switch (cabin) | digital_in | — | — | — | single_source | |
| OEM-A-4 | Injector 4 (cyl 4) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | single_source | |
| OEM-A-40 | Throttle position sensor 1 | analog_in | FT450-A-A21 | White input 2 | analog_in | single_source | |
| OEM-A-41 | TPS power (+5V) | vref | FT450-A-A14 | +5V sensor supply | vref | single_source | |
| OEM-A-43 | Diagnostic K-line | serial | — | — | — | single_source | |
| OEM-A-44 | Camshaft position sensor (G40) | trigger_in | FT450-A-A17 | Phase input (cam) | trigger_in | single_source | |
| OEM-A-49 | Secondary air injection relay control | low_side_out | FT450-A-A6 | Aux 4 (fuel pump / relays) | low_side_out | single_source | |
| OEM-A-5 | Check engine light (MIL) | low_side_out | — | — | — | single_source | |
| OEM-A-51 | MFA fuel-consumption signal | tacho_out | — | — | — | single_source | |
| OEM-A-52 | Ignition coil 4 (coil pack pin 4) | ignition_out | FT450-A-A10 | Ignition 3 | ignition_out | single_source | |
| OEM-A-53 | Idle air control valve (2nd) | low_side_out | — | — | — | single_source | |
| OEM-A-54 | Battery constant (+12V) | power_in | — | — | — | single_source | |
| OEM-A-55 | Ground (E-3) | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-A-56 | Ground (E-4) | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-A-59 | Mass airflow sensor (5th terminal) | sensor_out | — | — | — | single_source | |
| OEM-A-6 | Fuel pump relay control | low_side_out | FT450-A-A3 | Aux 1 | low_side_out | single_source | |
| OEM-A-60 | Ignition coil 3 (coil pack pin 3) | ignition_out | FT450-A-A9 | Ignition 2 | ignition_out | single_source | |
| OEM-A-65 | Vehicle speed sensor (VSS) | digital_in | — | — | — | single_source | |
| OEM-A-67 | Crank sensor return (VR-) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-A-68 | Crank position sensor (G28, VR+) | trigger_in | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-A-7 | Ground (E-2) | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-A-8 | Ignition coil 2 (coil pack pin 2) | ignition_out | FT450-A-A8 | Ignition 1 | ignition_out | single_source | |
| OEM-A-9 | Engine electronics relay control | low_side_out | FT450-A-A4 | Aux 2 | low_side_out | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-A-23 | SP-14V-1 | 0.85 | no route | ECU main power (from engine-electronics relay) | — | |
| W2 | SP-14V-1 | FT450-A-A13 | 0.85 | no route | +12V switched | — | |
| W3 | OEM-A-1 | SP-GND-1 | 0.85 | no route | Ground (E-1) | — | |
| W4 | OEM-A-10 | SP-GND-1 | 0.85 | no route | Ground (OBD1 EGR enable) | — | |
| W5 | OEM-A-55 | SP-GND-1 | 0.85 | no route | Ground (E-3) | — | |
| W6 | OEM-A-56 | SP-GND-1 | 0.85 | no route | Ground (E-4) | — | |
| W7 | OEM-A-7 | SP-GND-1 | 0.85 | no route | Ground (E-2) | — | |
| W8 | SP-GND-1 | FT450-A-A7 | 0.85 | no route | Power ground | — | |
| W9 | OEM-A-16 | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W10 | OEM-A-33 | SP-0V-1 | 0.5 | no route | Sensor ground bus | — | |
| W11 | OEM-A-67 | SP-0V-1 | 0.5 | no route | Crank sensor return (VR-) | — | |
| W12 | SP-0V-1 | FT450-A-A12 | 0.5 | no route | Signal ground | — | |
| W13 | OEM-A-41 | FT450-A-A14 | 0.5 | no route | TPS power (+5V) | — | |
| W14 | OEM-A-68 | FT450-A-A18 | 0.5 | no route | Crank position sensor (G28, VR+) | — | |
| W15 | SP-0V-1 | FT450-A-A18 | 0.5 | no route | RPM reference (crank -) | — | |
| W16 | OEM-A-44 | FT450-A-A17 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W17 | OEM-A-8 | FT450-A-A8 | 0.5 | no route | Ignition coil 2 (coil pack pin 2) | — | |
| W18 | OEM-A-60 | FT450-A-A9 | 0.5 | no route | Ignition coil 3 (coil pack pin 3) | — | |
| W19 | OEM-A-52 | FT450-A-A10 | 0.5 | no route | Ignition coil 4 (coil pack pin 4) | — | |
| W20 | OEM-A-24 | FT450-A-A1 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W21 | OEM-A-3 | FT450-A-A2 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W22 | OEM-A-26 | FT450-A-A1 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W23 | OEM-A-4 | FT450-A-A2 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W24 | OEM-A-25 | FT450-A-A1 | 0.5 | no route | Injector 5 (cyl 5) | — | |
| W25 | OEM-A-2 | FT450-A-A2 | 0.5 | no route | Injector 6 (cyl 6) | — | |
| W26 | OEM-A-17 | FT450-A-A20 | 0.5 | no route | MAF signal | — | |
| W27 | OEM-A-40 | FT450-A-A21 | 0.5 | no route | Throttle position sensor 1 | — | |
| W28 | OEM-A-14 | FT450-A-A24 | 0.5 | no route | Coolant temperature (CLT) | — | |
| W29 | OEM-A-49 | FT450-A-A6 | 0.5 | no route | Secondary air injection relay control | — | |
| W30 | OEM-A-6 | FT450-A-A3 | 0.5 | no route | Fuel pump relay control | — | |
| W31 | OEM-A-9 | FT450-A-A4 | 0.5 | no route | Engine electronics relay control | — | |
| W32 | OEM-A-27 | FT450-A-A5 | 0.5 | no route | Idle air control valve | — | |
| W33 | OEM-A-20 | FT450-A-A22 | 0.5 | no route | O2 sensor 1 (primary) | — | |
| W34 | OEM-A-15 | FT450-A-A26 | 0.5 | no route | EGR temperature sensor | — | |
| W35 | OEM-A-36 | FT450-A-A23 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W36 | OEM-A-37 | FT450-A-A25 | 0.5 | no route | A/C compressor switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (11)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | NET_MERGED | FT450-A-A1 + OEM-A-24 + OEM-A-25 + OEM-A-26 | 3 different OEM functions share one net: OEM-A-24 Injector 1 (cyl 1); OEM-A-25 Injector 5 (cyl 5); OEM-A-26 Injector 3 (cyl 3) |
| error | NET_MERGED | FT450-A-A2 + OEM-A-2 + OEM-A-3 + OEM-A-4 | 3 different OEM functions share one net: OEM-A-2 Injector 6 (cyl 6); OEM-A-3 Injector 2 (cyl 2); OEM-A-4 Injector 4 (cyl 4) |
| error | REQUIRED_UNMAPPED | OEM-A-34 | Required OEM function "Knock sensor 1" (knock_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-A-38 | Required OEM function "Ignition switch (run/start)" (digital_in) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | FT450-A-A3 | FT450-A-A3 "Aux 1" drives OEM-A-6 Fuel pump relay control (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | FT450-A-A4 | FT450-A-A4 "Aux 2" drives OEM-A-9 Engine electronics relay control (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | FT450-A-A6 | FT450-A-A6 "Aux 4 (fuel pump / relays)" drives OEM-A-49 Secondary air injection relay control (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | NET_FAMILY | OEM-A-37 ↔ FT450-A-A25 | OEM-A-37 "A/C compressor switch" [digital_in] is wired to FT450-A-A25 "White input 6 (fuel pressure)" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| info | NET_FAMILY | FT450-A-A12 ↔ FT450-A-A18 | FT450-A-A12 "Signal ground" [sensor_ground] is wired to FT450-A-A18 "RPM reference (crank -)" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | NET_FAMILY | OEM-A-36 ↔ FT450-A-A23 | OEM-A-36 "Intake air temperature (IAT)" [temp_in] is wired to FT450-A-A23 "White input 4 (oil pressure)" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | UNMAPPED | OEM | 10 optional OEM pins are not mapped: OEM-A-21 Diagnostic L-line; OEM-A-22 Tachometer output; OEM-A-31 EVAP canister purge valve; OEM-A-39 A/C switch (cabin); OEM-A-43 Diagnostic K-line; OEM-A-5 Check engine light (MIL); OEM-A-51 MFA fuel-consumption signal; OEM-A-53 Idle air control valve (2nd); OEM-A-59 Mass airflow sensor (5th terminal); OEM-A-65 Vehicle speed sensor (VSS) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-A-54 | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - OEM-A 34: Knock sensor 1: no free knock input on FuelTech FT450 - OEM-A 38: Ignition switch (run/start): key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); FuelTech FT450 has no dedicated key-on input Not wired: - OEM-A 54: Battery constant (+12V): FuelTech FT450 has no battery-constant input; not needed - OEM-A 31: EVAP canister purge valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-A 5: Check engine light (MIL): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-A 53: Idle air control valve (2nd): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-A 22: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on FuelTech FT450 - OEM-A 51: MFA fuel-consumption signal: no free tacho/frequency_out/low_side/ls_hs on FuelTech FT450 - OEM-A 65: Vehicle speed sensor (VSS): no free frequency_in/switch_in on FuelTech FT450 - OEM-A 39: A/C switch (cabin): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-A 21: Diagnostic L-line: no free k_line on FuelTech FT450 - OEM-A 43: Diagnostic K-line: no free k_line on FuelTech FT450 - OEM-A 59: Mass airflow sensor (5th terminal): no rule for class sensor_signal; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | FuelTech FT450/FT550 ready harness manual (4 & 6 cylinder) — FT450 Connector A pinout | http://ftmanager.fueltech.com.br/downloads/manual/Portugues/Chicote_pronto_FT450-FT550.pdf | — | — | — |
| 2 | community_copy | a2resource: VR6/ABA Motronic M2.9 (OBD1) engine control unit pinout | http://www.a2resource.com/electrical/management/motronicvr6aba.html | — | — | — |